crypto/openssl-0.9.7d/crypto/bio/bss_mem.c

   1 /* crypto/bio/bss_mem.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <errno.h>
  61 #include "cryptlib.h"
  62 #include <openssl/bio.h>
  63
  64 static int mem_write(BIO *h, const char *buf, int num);
  65 static int mem_read(BIO *h, char *buf, int size);
  66 static int mem_puts(BIO *h, const char *str);
  67 static int mem_gets(BIO *h, char *str, int size);
  68 static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  69 static int mem_new(BIO *h);
  70 static int mem_free(BIO *data);
  71 static BIO_METHOD mem_method=
  72         {
  73         BIO_TYPE_MEM,
  74         "memory buffer",
  75         mem_write,
  76         mem_read,
  77         mem_puts,
  78         mem_gets,
  79         mem_ctrl,
  80         mem_new,
  81         mem_free,
  82         NULL,
  83         };
  84
  85 /* bio->num is used to hold the value to return on 'empty', if it is
  86  * 0, should_retry is not set */
  87
  88 BIO_METHOD *BIO_s_mem(void)
  89         {
  90         return(&mem_method);
  91         }
  92
  93 BIO *BIO_new_mem_buf(void *buf, int len)
  94 {
  95         BIO *ret;
  96         BUF_MEM *b;
  97         if (!buf) {
  98                 BIOerr(BIO_F_BIO_NEW_MEM_BUF,BIO_R_NULL_PARAMETER);
  99                 return NULL;
 100         }
 101         if(len == -1) len = strlen(buf);
 102         if(!(ret = BIO_new(BIO_s_mem())) ) return NULL;
 103         b = (BUF_MEM *)ret->ptr;
 104         b->data = buf;
 105         b->length = len;
 106         b->max = len;
 107         ret->flags |= BIO_FLAGS_MEM_RDONLY;
 108         /* Since this is static data retrying wont help */
 109         ret->num = 0;
 110         return ret;
 111 }
 112
 113 static int mem_new(BIO *bi)
 114         {
 115         BUF_MEM *b;
 116
 117         if ((b=BUF_MEM_new()) == NULL)
 118                 return(0);
 119         bi->shutdown=1;
 120         bi->init=1;
 121         bi->num= -1;
 122         bi->ptr=(char *)b;
 123         return(1);
 124         }
 125
 126 static int mem_free(BIO *a)
 127         {
 128         if (a == NULL) return(0);
 129         if (a->shutdown)
 130                 {
 131                 if ((a->init) && (a->ptr != NULL))
 132                         {
 133                         BUF_MEM *b;
 134                         b = (BUF_MEM *)a->ptr;
 135                         if(a->flags & BIO_FLAGS_MEM_RDONLY) b->data = NULL;
 136                         BUF_MEM_free(b);
 137                         a->ptr=NULL;
 138                         }
 139                 }
 140         return(1);
 141         }
 142
 143 static int mem_read(BIO *b, char *out, int outl)
 144         {
 145         int ret= -1;
 146         BUF_MEM *bm;
 147         int i;
 148         char *from,*to;
 149
 150         bm=(BUF_MEM *)b->ptr;
 151         BIO_clear_retry_flags(b);
 152         ret=(outl > bm->length)?bm->length:outl;
 153         if ((out != NULL) && (ret > 0)) {
 154                 memcpy(out,bm->data,ret);
 155                 bm->length-=ret;
 156                 /* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */
 157                 if(b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret;
 158                 else {
 159                         from=(char *)&(bm->data[ret]);
 160                         to=(char *)&(bm->data[0]);
 161                         for (i=0; i<bm->length; i++)
 162                                 to[i]=from[i];
 163                 }
 164         } else if (bm->length == 0)
 165                 {
 166                 ret = b->num;
 167                 if (ret != 0)
 168                         BIO_set_retry_read(b);
 169                 }
 170         return(ret);
 171         }
 172
 173 static int mem_write(BIO *b, const char *in, int inl)
 174         {
 175         int ret= -1;
 176         int blen;
 177         BUF_MEM *bm;
 178
 179         bm=(BUF_MEM *)b->ptr;
 180         if (in == NULL)
 181                 {
 182                 BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER);
 183                 goto end;
 184                 }
 185
 186         if(b->flags & BIO_FLAGS_MEM_RDONLY) {
 187                 BIOerr(BIO_F_MEM_WRITE,BIO_R_WRITE_TO_READ_ONLY_BIO);
 188                 goto end;
 189         }
 190
 191         BIO_clear_retry_flags(b);
 192         blen=bm->length;
 193         if (BUF_MEM_grow_clean(bm,blen+inl) != (blen+inl))
 194                 goto end;
 195         memcpy(&(bm->data[blen]),in,inl);
 196         ret=inl;
 197 end:
 198         return(ret);
 199         }
 200
 201 static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
 202         {
 203         long ret=1;
 204         char **pptr;
 205
 206         BUF_MEM *bm=(BUF_MEM *)b->ptr;
 207
 208         switch (cmd)
 209                 {
 210         case BIO_CTRL_RESET:
 211                 if (bm->data != NULL)
 212                         {
 213                         /* For read only case reset to the start again */
 214                         if(b->flags & BIO_FLAGS_MEM_RDONLY)
 215                                 {
 216                                 bm->data -= bm->max - bm->length;
 217                                 bm->length = bm->max;
 218                                 }
 219                         else
 220                                 {
 221                                 memset(bm->data,0,bm->max);
 222                                 bm->length=0;
 223                                 }
 224                         }
 225                 break;
 226         case BIO_CTRL_EOF:
 227                 ret=(long)(bm->length == 0);
 228                 break;
 229         case BIO_C_SET_BUF_MEM_EOF_RETURN:
 230                 b->num=(int)num;
 231                 break;
 232         case BIO_CTRL_INFO:
 233                 ret=(long)bm->length;
 234                 if (ptr != NULL)
 235                         {
 236                         pptr=(char **)ptr;
 237                         *pptr=(char *)&(bm->data[0]);
 238                         }
 239                 break;
 240         case BIO_C_SET_BUF_MEM:
 241                 mem_free(b);
 242                 b->shutdown=(int)num;
 243                 b->ptr=ptr;
 244                 break;
 245         case BIO_C_GET_BUF_MEM_PTR:
 246                 if (ptr != NULL)
 247                         {
 248                         pptr=(char **)ptr;
 249                         *pptr=(char *)bm;
 250                         }
 251                 break;
 252         case BIO_CTRL_GET_CLOSE:
 253                 ret=(long)b->shutdown;
 254                 break;
 255         case BIO_CTRL_SET_CLOSE:
 256                 b->shutdown=(int)num;
 257                 break;
 258
 259         case BIO_CTRL_WPENDING:
 260                 ret=0L;
 261                 break;
 262         case BIO_CTRL_PENDING:
 263                 ret=(long)bm->length;
 264                 break;
 265         case BIO_CTRL_DUP:
 266         case BIO_CTRL_FLUSH:
 267                 ret=1;
 268                 break;
 269         case BIO_CTRL_PUSH:
 270         case BIO_CTRL_POP:
 271         default:
 272                 ret=0;
 273                 break;
 274                 }
 275         return(ret);
 276         }
 277
 278 static int mem_gets(BIO *bp, char *buf, int size)
 279         {
 280         int i,j;
 281         int ret= -1;
 282         char *p;
 283         BUF_MEM *bm=(BUF_MEM *)bp->ptr;
 284
 285         BIO_clear_retry_flags(bp);
 286         j=bm->length;
 287         if (j <= 0)
 288                 {
 289                 *buf='\0';
 290                 return 0;
 291                 }
 292         p=bm->data;
 293         for (i=0; i<j; i++)
 294                 {
 295                 if (p[i] == '\n') break;
 296                 }
 297         if (i == j)
 298                 {
 299                 BIO_set_retry_read(bp);
 300                 /* return(-1);  change the semantics 0.6.6a */
 301                 }
 302         else
 303                 i++;
 304         /* i is the max to copy */
 305         if ((size-1) < i) i=size-1;
 306         i=mem_read(bp,buf,i);
 307         if (i > 0) buf[i]='\0';
 308         ret=i;
 309         return(ret);
 310         }
 311
 312 static int mem_puts(BIO *bp, const char *str)
 313         {
 314         int n,ret;
 315
 316         n=strlen(str);
 317         ret=mem_write(bp,str,n);
 318         /* memory semantics is that it will always work */
 319         return(ret);
 320         }
 321